Neighborhood volunteers first began cultivating the idea of converting the ruins of the Reading Viaduct into Philadelphia’s own elevated park more than a decade ago.

After years of organizing, raising money, and drafting proposals, their efforts – and those of the politicians and professional planners who joined the cause – finally appear ready to bear fruit. Without fanfare, the city and the state have included millions of dollars in their latest budgets toward the first phase of the project: transforming the quarter-mile railroad “spur” that curves through the city’s burgeoning Loft District and dead-ends onto North Broad Street.

Turning that section into a park with stunning Center City views is just a small part of the overall vision to “green” abandoned railroad infrastructure, transforming foreboding eyesores into amenities.

A larger, 4/5-mile section of the viaduct stretches with fortresslike walls from Fairmount Avenue to Vine Street. Across Broad, the old railroad line drops below street level, running through a subterranean channel from the former Inquirer and Daily News building to Fairmount Park at Girard Avenue.

Formerly known as Pier 53, Washington Avenue Green is located at Washington Avenue, just south of the Coast Guard station and behind the Sheet Metal Workers’ Union Hall, 1301 South Columbus Boulevard. The one-acre site on the long-abandoned pier is one of the few tracts along the Delaware riverfront that is owned by the City of Philadelphia. It is the first of the public parks to be created by the Action Plan for the Central Delaware. Because there has been no commercial activity at that location for decades, the pier that originally had welcomed ships and freight carriers has deteriorated, and both native and non-native trees and plants took hold and flourished.

The rotted piers and eroded shoreline have become a nursery for migrating fish and a permanent home for several species of mussels.

This newly discovered habitat is being exploited and informs the park’s unique spirit. Delaware Avenue Green has been redesigned and reconstructed as a public space on the interim trail that is planned for the southern section of the Central Delaware.

Flushing Meadows-Corona, which has been the setting for two World’s Fairs, is considerably larger than Central Park, at 1,225 acres, compared with 843. Last year, its conservancy attracted $5,000 in donations.

The park’s bicycle and walking paths are cracked and pitted, Mr. Kress said, and its natural areas are overgrown with invasive species. “Central Park is doing pretty well,” said Mr. Kress, who is also president of the Queens Coalition for Parks and Green Spaces, noting that though Mr. Paulson’s home on Fifth Avenue overlooks Central Park, he grew up in Queens. “I’m not saying he owes anyone anything, but how about you give Central Park $98 million and Flushing Meadows-Corona $2 million? That two million would have gone so much further in an underappreciated park.”